If I were a boy, and my mom had circ'd me because it can supposedly reduce my chances of getting an STD, it would have been pointless. I am hyper vigilante about wearing a condom correctly AND the only people I have ever engaged in any sexual act with have all been virgins (and beyond that, had never experienced any sexual act one generally doesn't think takes the v card but can still spread STD's)
I've never been exposed to an STD because my partners have never been exposed to STD's. It would have been pointless because not only was I not the type to have sex willy nilly (not saying those who do are 'bad,' I just don't myself) but I made sure the protection was at max regardless of my partners past partners, or lack there of.
Even if circumcision reduces the risk of STD's, I feel it should still be left to the boy to determine if he wants that particular protection via a surgery AFTER learning that he will STILL need a condom because it doesn't ELIMINATE STDs. He will still be at risk to himself and his partners circumcision or not if he isn't wearing a condom every.single.time.